Cutting tool



Dev 29 u F. H. BLANDING CUTTING TOOL Filed dan. 31. 1924 'Patented Dec 2. 192.4#l c specification.

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ronnnsr n. BnmnI'Ne, y'or nnrnc`1r.1ir`cnrcan, Assioma' lTo cnrcaeo rmnmrrc x moor. comm, orNnw Yoan, N. Y.,Aconronar1onor Naw JERSEY'.

A' -cnrrme'roon ai application mea January s1, 1924.. scheine 689,617.

To all 'yhom t may concern; f Be it known that I; Fonnns'r H. BLANDING,

a citizen of the United States of America,- and resident ,ofDetroit, `in 4the countyl of` Waynei'and State of Michigan, have invented certain newand` useful vImprovements `in Cutting ".lvoolsrk of which the rfollowing is: ya

This invention lrelates to cutting tools yof the type particularly adapted forfcuttingv designs in the treads of vehicle tires. for

regroovingsuch tire'vtre'ads after they have fbecome worn, andforsimilar uses. :More

rticularly it hasto dolwith tools of this 'nd which' have a separable blade orcutting element. One well'known toolof this kind has a channelled blade of resilient material slidably seated ina groove in the holder fand retained therein by-its own resiliency., In such tools it is essential that the abut-f pment againsth which rthe rblade bears inl efecting'the cut be squarely ytransverseto the :direction of the cut, or such as `,to maintain the" sides of the channelled blade in lparallelism with the raxis 'of the cut,- since otherwise the blade is sub'ected` to distort-v -ive strain resulting in brea cage of theblade blade hol er in the plane of the blade Aretaining grooves. n

highlyI objectionable since the transverse Such an arrangement is bore weakens the holder which has to .withstand shattering strains f.of greatlintensity.

due tothe blows of the percussive tool and the violent reaction theretoof'the material, through which the blade must be vforced.

Hence one of the primary objectsA cfr-the `invention is to rovide a1 properly disposed abutment for t e blade without weakening l the holder. Other objects will-be apparent yfrom the. detailed descriptionofthe inven'y tion which follows.'

In its simplest form the` invention ccomf uses the use' of a `separate Aabu'tmentmem'- r in a cutting tool of the-described typet Such ya member, which may be' blanked l from sheet material' or otherwise cheaply v .r constructed, lI'Jreferably'slides in the blade `l`receiving channel ahead of the bladek and is varranged to be maintained againstan'gular 4displacement within the channel.l In orderto 4make 4clear the invention, one concrete `ed to be removabl ,embcdimnt-fhref Iis; shown' i'n the accompanying drawings, in which:

-- Flg-. A1 is aside elevational view'fof the -Cutting m01;y y n Y f Fig. 2 is a botten; pian View paruyfbreken awayshowing the abutment member in place and a cutting element [about to'A be inserted; d

Fig. .3 is alright end elevation ofthe dey vice KAshown Fig. 1, ywith the vCutting e1e ment removed;v t

f Figa isa detail pin; ifiwioffL the @but ment member ;l

the cutting tool in operation. y. 4 l

In the embodiment of the invention illusktrat'edythe cutting tool comprises three vdistinctfbut cooperatingt parts,` a holder A. a

cutting elementB, and an abutment member C for the cutting element. @Theholder^ has arelatively ,widehead 9 from which extends Fig. v5iS a perspective ,viewillustrating fa shank terminating in a handlef10 which is preferablyshaped and *.intendedto re,-

.ceive the blow of a percussive motor. The

lower faceof the head 9 of thejholder has a longitudinal recess or channel 11." (Fig. 3) having its sidesundercut by4 longitudinal grooves 12 extending part way through the head and .merging'intochannel'11,by thev provision of the bevelled faces 13 onrthe head adjacent the channel.

The cuttingelement or blade r l supported within the channelllf of vthe ead 9 andto dispose a cutting edge beneath said headm'rFor this purpose ythe element is channel shaped and side yflanges -14 whichiit Awithin the grooves 12. the adjacent inclined 'sides of the blade fitting `against the `bevelled surfacesA 13 of" head 9. The cutting element is inserted may-.beslid along the channel 11 to theposi` tion illustrated in FigLl, the kblade fnow being held in the. holderk by its'.A own resilienc n n. j

Ixyiorder lto keep the angesfofthe blade from contact with "the roundedmilled 'ends of the grooves 12 and 'to suitably support the blade -within the channel so that it vmay n ot be broken or tornoutcwhile in o peratlon, abutment means kare providedv within B is. adaptfof spring steel,.provide diwith'longitudinal v cutting element having I of channel 11( beyond the channel 11 and form an important feature of the invention. The preferred means for this -`purpose comprise the abutment member or plate C of a' size and shape to t within and to span channel 11. Member'C'hasjside extensions 15 fitting within the grooves 12 and the anges 14 of the cutting element,v these abutments forming a part of the `transverse end or abutment face 16. The extensions 15 are rounded rearwardly as indicated to fit the rounded ends of grooves 12. The abutment portion of member Chas a tail extension 17, Vthe sides of which fit the sides grooves 12 and prevent angular displacement of the ymember C within the' channel 11. For convenience and ease in manufacture, the 'abutment member C is made as a separate element, but after it has been slipped into place within the channel 11 it may be. secured therein in any suitable or desired manner. Member C which isof a thickness to closely fit the grooves 13, may be cheaply constructed by blankingmfrom sheet material. l

In preparing the cutting tool for use` thev abutment member C is irst slid into the position illustrated in Fig. 2 with thev rear faces ofthe side extensions 15 in contact with the ends of grooves 12 and the tail piece 17 within thev channel 11 beyond the grooves. is then sprung into thechannel in the manner heretofore described and slid longitu.

dinally thereof until the ends of the side flanges 14 contact the abutment Jrace 16 ofmember C. lThe tool is now ready for operation, the manner of its use being illustrated in Fig. wherein it is lshown as making grooves in a truck tire, the cutout portions of the tire tread passing out beneath the abutment C and under the shank portion of the holder. While the holder A. may be manuallysupported and the end of the handle struck with a hammer, it is preferable to use for driving the blade through `such highly `resistant material as that of truck tires a percussive device such as a pneumatic hammer indicated kat X in Fig. 5.

While but one form of the invention has been herein disclosed, it is to be understood that the inventionl is not limited to this specilic form but is capable of adaptation and modification within the scope of the appended claims. l

Having now'describedmy invention and the manner of its use, what I claim and desire to secureby Letters Patent is:

1. In adevice of the class described, the combination of a holder having grooves, a edges retained in said grooves, and n means engaglng said grooves and providing an abutment for said element,

. grooves,

gagingsaid grooves and providingvan abutprovi'ding a'butments for The cutting lelement or blade By 2. In a device of the class described, comy 'bination of a vholder having grooves, a cuttingelement having edges retained in said and a member having parts enment for'said element. y

3. In a device of the class described, the

Ycombina-tion of a holder having a channel therein and grooves opening into said channel, a channel-shaped cutting element having side anges fitting in said grooves, and means engaging. said rooves providing `abutments for the side anges of said element.- f y 4. In a device' of the class described, the combination of a holder having yafchannel therein and grooves opening into said lchannel for receiving the side flanges of a channel-shaped cutting element, and means rdisposedwithin said channel to provide an abutment for the cuttingelement.

e `5,;Ina device of the class described, rthe combination of a holder having a channel thereinand grooves opening into said channel, a channel-shaped cutting element having side anges fitting in said grooves, and means spanning said channel and engaging said grooves to provide an abutmentr for said element.

6. In a device of the class described, the combination of a holder having a channel therein and grooves opening into said channel, a channel-shaped cutting element having side ianges fitting in said grooves, a removable member spanning said channeland Ahaving parts fitting within said grooves to pro vide an abutment for said element.

7. In combination, a channel-shaped cutting element of resilient material, a holder having a recess in which said element is retained` by its own resiliency, and removable means disposed within said recess and providing an abutment transverse to the longitudinal axis ofsaid element.

8. In combination, a holder having a channeltherein and grooves merging into said channel for a portion of its length, a channel-shaped cutting element having side flanges fitting in said grooves, and a member blanked from sheet material seated in said channel and presenting an abutment face engaged by the ends of the flanges of said element. l

9. In combination, a holder having a channel therein and grooves merging into said channel for a portion of its length, a channel-shaped cutting element having side flanges fitting in said grooves, and a member seated in said channel having projections extending within said grooves to form abutments for the ends of the vianges of said element, the other faces of said projections beingshaped to lit the ends of said grooves.

10. 1n combination, a holder lgiavingl a channel therein and grooves merging' into said channel for a portion of its flan es tting in said grooves, and a member lanked from sheet material seated in said channel with projecting portions at the sides fitting said grooves to form abutments for the -ends ofthe flanges of said element, the other faces of said portions being shaped to iit the ends of said grooves,

' and with a tail piece fitting the channel beyond said grooves to prevent angular displacement of said member within said channel.

11. An abutment piece for the channelled blades oli-cutting tools-1t in which the blade holder has a channel, with undercut sides forming a socket for slidably receiving the blade; said v piece comprising a member adapted tobe disposed in said channel with side portions ttln said grooves to present an abutment ace transverse to said channel. v

12. An abutment piece for the channelled blades of cutting tools in .which the blade holder has a channel with undercut` sides Yforming a socket forv slidably receiving the s enga, a channel-shaped cuttlng element having side blade, said piece comprising a member adapted to be disposed in said channel having integra-l side extensions making a sliding fit with said grooves and shaped to t, the ends ci said grooves to present to the blade an abutment face transverse to said channel.'

13. An abutment memberfor the channelled blades of cutting tools in which the tool holder has achannel, the sides of which are undercut as to a portion of its length by grooves merging into the channel, said member comprising a plate adapted to span said channel and having side extensions t- 'tin into said grooves and a tail extension fitting the channel beyondy said grooves to prevent angular displacement of the member within said channel.

14. An abutment piece for tools ofthe class described blanked from sheet material having parallel sides and a transverse front face projecting beyond said sides and curved faces joining said front face to said parallel S1 6S- iA ISigned b me at Detroit, Michigan this 28th day o January 1924. FORREST H. BLANDING. 

